importjava.util.ArrayList;importjava.util.List;publicclassStringToCollectionExample{publicstaticvoidmain(String[]args){// 步骤 1: 准备一个包含数据的 StringStringdata="Apple,Banana,Cherry,Date";// 步骤 2: 将 String 拆分成多个元素String[]items=data.split(",");// 步骤 3: 创建集合对象List<Strin...
publicvoidfilterEmployeesThenGroup(){// 先 筛选List<Employee>employees=getAllEmployees().stream().filter(employee->"上海公司".equals(employee.getSubCompany())).collect(Collectors.toList());// 再 分组Map<String,List<Employee>>resultMap=newHashMap<>();for(Employee employee:employees){List<Employee...
不过特别注意,toList、toCollection是不支持并行运行的,但toSet()方法支持并行运行。 我们首先来看一个一直使用的示例,返回菜单中所有菜品的名称: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1publicstaticvoidtest_toList(List<Dish>menu){2List<String>names=menu.stream().map(Dish::getName)3.collec...
我们可以将这个数组转换为集合。 示例代码 importjava.util.ArrayList;importjava.util.Arrays;importjava.util.List;publicclassStringToCollection{publicstaticvoidmain(String[]args){Stringstr="Java,Python,Ruby,JavaScript";// 使用split方法分割字符串String[]fruitsArray=str.split(",");// 转换为List集合List<...
}publicStringgetName(){returnname; }publicvoidsetName(String name){this.name = name; }publicStringgetNumber(){returnnumber; }publicvoidsetNumber(String number){this.number = number; }publicIntegergetScore(){returnscore; }publicvoidsetScore(Integer score){this.score = score; ...
归集(toList/toSet/toMap) 因为流不存储数据,那么在流中的数据完成处理后,需要将流中的数据重新归集到新的集合里。 toList、toSet和toMap比较常用,另外还有toCollection、toConcurrentMap等复杂一些的用法。 List<Integer> list = Arrays.asList(1, 6, 3, 4, 6, 7, 9, 6, 20); ...
8.创建不可修改的列表:toUnmodifiableList() 可以创建只读列表。任何修改都会导致UnsupportedOperationException。 示例代码: List<String>strings=Arrays.asList("alpha","beta","gamma");List<String>collect2=strings.stream().collect(Collectors.toUnmodifiableList());//输出:["alpha","beta","gamma"] ...
toList()); // Accumulate names into a TreeSet Set<String> set = people.stream().map(Person::getName) .collect(Collectors.toCollection(TreeSet::new)); // Convert elements to strings and concatenate them, separated by commas String joined = things.stream() .map(Object::toString) .collect...
List<Integer> intList = Arrays.asList(1,2,3);Stringresult=intList.stream() .map(n -> String.valueOf(n)) .collect(Collectors.joining("-","{","}")); System.out.println(result); }Copy Output: {1-2-3}Copy TheCollectors.joining()method requires aCharSequence, so we need tomaptheIn...
[Android.Runtime.Register("synchronizedCollection","(Ljava/util/Collection;)Ljava/util/Collection;","")] [Java.Interop.JavaTypeParameters(new System.String[] {"T"})]publicstaticSystem.Collections.ICollectionSynchronizedCollection(System.Collections.ICollection c); ...